Title :
Tunable and flexible Barium Strontium Titanate (BST) varactors on Liquid Crystal Polymer (LCP) substrates
Author :
Shen, Ya ; Ebadi, Siamak ; Wahid, Parveen ; Gong, Xun
Author_Institution :
Department of Electrical Engineering and Computer Science, University of Central Florida, Orlando, 32816, U.S.A.
Abstract :
Tunable inter-digital capacitors (IDCs) are presented on flexible Liquid Crystal Polymer (LCP) substrates for the first time. Barium Strontium Titanate (BST) ferroelectric material is used as the tuning mechanism. A unique transfer process has been implemented to realize the BST thin film on the LCP substrate. In addition, due to the monolithic integration process, there is no wire bonding or packaging. This has allowed for successful demonstration of tunable and flexible IDCs up to 50 GHz. Tunability of 22–28% and Q factors of 80–7 have been measured in the frequency range of 0.01–50 GHz. To our knowledge, this is the first demonstration of a tunable ferroelectric device on 100% flexible materials without the use of any rigid components. This technology will have a wide range of applications in new generation of agile, high-frequency, and flexible electronics.
Keywords :
Capacitance; Frequency measurement; Microwave filters; Q factor; Q measurement; Substrates; Voltage measurement; Capacitors; ferroelectric films; flexible electronics; liquid crystal polymers; tunable circuits and devices;
Conference_Titel :
Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International
Conference_Location :
Montreal, QC, Canada
Print_ISBN :
978-1-4673-1085-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2012.6259668
